Tubular rivet



R. S. COLLEY TUBULAR RIVET July 24, 1951 Filed Aug. 29, 1947 ilzrllllvwl v A; Z522% j v needed to accommodate relatively thickwork.

Patented July 24, 1951 RIVET Russell S. GOlIey-Kent,filifiiogassiigiiorito B. F. Goodrich 'Gompany-,'-Newreek, Y acorporation of'New York I I Application August 29, 19 16 7, Serial lilo.3T7 1, 231

fbore'extending in from the head end providing a relatively thin walladapted to be outwardly bulged against the work and'terminatin'g in athreaded portion 'engageable with a drawrbdof a heading tool.

- The prior rivet, while being-capable of accominodating variations inwork thickness, sometimes re'ferred to as grip range, has been limitedClaims. 1; 103

in the range ofsuch thickness throughout which 7 themost effectiveupsetting can be effected, this range having been dependent to a largeextent upon the ratio o'f slenderness oi the wall of the 'cb'unterboredportion which is outwardly bulged in the upsetting operation. Themater-ialvavailable for outward bulging has been that :part of the'wauof the counterbored portion between the work and the first threadconvolution, and the recommended grip range has of necessity beenconsiderably less than the total length O'f the counterb'ore.

the counterbore, to the end of increasing the 'grip ra'nge, has had theobjection that for very thin work and for very thick work, the bulge hassometimes been formed in a faulty manner-so An object of this inventionis to provide a. tubular rivet of an improved construction for .ac-

' :commoda-ting 'work over an increased range of Jthicknesses. Furtherobjects are to provide a I atubular rivet having-a wall constructionsuchthat ,,-itmay be outwardly bulged for strong gripping rofwork bothof very small thickness and, of relawork thickness, to provide aninternal thread construction inwhich the thread does not beginwithsabruptfull depthbut is of gradually increasing depth, therebymaking a portion of the ,threaded region capable of outward bulging as 21s an elevation-Dram 1ivet sliown in rag.

-Mere extension of the length of v although the pitch and root of thesethreads rel in the upset condition as applied to relatively thin workwith a draw rod and setting anvil of'a lie ding to'o'l before the latterare reihoved ipa'itsfbei'ng sectioned and broken away.

' ig. '3 "is fasebtional elevation of the rivet in the upset C nditiohas applied to relatively thick were, parts being broken away. p

Fig. 4 is a perspective view of the rivet prior to insertion in thework.

In accordance with the "invention a tubular rivet H! as it appearsbefore upsetting is shown in Figs. 1 and 4. The rivet I9 comprises'ashank 'I LKWhichImay be flanged at one end to form a head [2, and has abore extending 'th'e'rethrough.

The here is 'tnreadedat 1'! for receiving 'ascrew for a heading tool forupsetting the rivet "It and for'frece'iving a screw of a bolt afterupsetting of the rivet. The wall of the shank H is "of greater thicknessat the threaded portion ['4' than at-the portion adjacent the head end1? and gradually decreases in thickness toward the head end; Although adecrease in thickness "may be obtained progressively in any "suitablemanner it is -piefe'rred to obtain this by tapering the wall in"thickness toward the head end, as by tapering the bore from the headend to an angle such as is indicated by the broken lines l3, I3;

The tapered wall portion extends into the threaded portion 14 andfthecrestoi' the threads toward the/head end 12 conform to the taper n-thesam'e. 'By removing part of these threadsfthe load imposed inupsetting the rivet is "distributed "more evenly over the wall and isnot thatrfull holding strength has not been obtained.,.-; 5iioncentrated inafew threads.

Infi'i'g' 2 therivet [-0 is shown in the upset con- -dition gripping-'vv o'rk it: which may comprise that; inore'thin sheets of metal orother material. The sheet member i5 is apertured at I 6 to receive "therivet -10. in order to upset the rivet l0 it is inserted in the sheetmernber it with the name of the head-end i2 against the on. r 'surfaceof the wall'of the sheet member. draw rodl1=-of a'heading tool isthreaded to "e"ifga-ge' the threaded portion 1 of the shank M. phedra'w-rod H is pulled toward-asetting arivil 1 8 of the heading toolwhich movement subteens "the sha'nkto an axial upsetting forcethroughthe threads"of the'shank. Th'e upsetting *ioroe 'is applied withcircumrerential uniformity by virtueof the threaded-connection whichassures uniform pressure application entirely und-the-rivet b'ythe drawrodll. The taper o ane-"shahk-peruon H causes the wall portion havingthelea'st resistance to outward "bulging to be aidriacent the wall ofthe sheet member 1-51as the shank wall thickness is progressivelygreater -=away rrem-the 'work, 'andthe wall is? substantially supportedthe aperture- 16 of the sheet :mem- "Her l 'i' toviidrd the head end- H.A coereeuy sults upon upsetting as shown in Fig. 2. The heading tool maybe removed by unscrewing the draw rod 11 whereupon the rivet l not onlyis held in the work but produces internal threads in which a holdingscrew may be inserted for attachment purposes if desired.

In Fig. 3 the rivet I0 is shown in the upset condition gripping a sheetmember 20 of greater thickness than the sheet member I5 shown in Fig. 2.Because the position of outward bulging is determined by the thicknessof the sheet member the same size rivet grips the relatively thick sheetmember 28 with effectiveness, a part of the tapered and threaded wallbeing bulged in this application.

It is evident that a considerable range of thicknesses of work may beaccommodated by the rivet of the invention. This is highly desirable forreasons among others of reducing the number of rivet sizes needed toaccommodate the variety of thicknesses of work which may be used withthis rivet.

Variations may be made without departing from the scope of the inventionas it is defined inthe following claims.

I claim:

1. A tubular rivet adapted to be upset in work b outward bulging of thewall of the rivet under an axial upsetting force and axial pressing ofthe bulge against the face of the work, said rivet comprising a shankhaving a bore extending therein from an end thereof and having acylindrical threaded portion, the root diameter of the threaded portionbeing uniform throughout and the wall of the shank being graduallyreduced in thickness from said threaded portion toward said endproviding for outward bulging anywhere along the extent of the reducedwall thickness as determined by the thickness of the work against whichthe bulge is pressed in the axial direction.

2. A tubular rivet adapted to be upset in work by outward bulging of thewall of the rivet under an axial upsetting force and axial pressing ofthe bulge against the face of the work, said rivet comprising a shankhaving a bore extending into said shank from an end thereof, said shankbeing internally threaded with the root diameter of the threaded portionbeing uniform throughout and the wall of the shank being graduallyreduced in thickness toward said end providing for outward bulginganywhere along the extent of the reduced wall thickness as determined bythe thickness of the work against which the bulge is pressed in theaxial direction. 3. A tubular rivet adapted to be upset in wor byoutward bulging of the wall of the rivet under an axial upsetting forceand axial pressing of the bulge against the face of the work, said rivetcomprising a shank having a head end and a bore extending into saidshank from said head end, said bore tapering away from said head end andterminating in a cylindrical portion thereof for outward bulginganywhere along the extent of the tapered wall thickness as determined bythe thickness of the work against which the bulge is pressed in theaxial direction, said cylindrical ing a head end and a bore extendinginto the shank from said head end terminating in a threaded portion forengaging a threaded up- 1 setting member to upset the rivet by outwardthreaded portion, thereby providing for outward bulging anywhere alongthe extent of the tapered wallthickness against which the bulge ispressed in the axial direction.

5. A tubular rivet adapted to be inserted in an aperture in sheetworkmaterial and upset therein from one side of the work to grip work byoutward bulging thereof and axialpressing of the bulge against the faceof the work, said rivet comprising a tubular shank having a flanged headat one end thereof and a bore extending into the shank from said headand terminating in a threaded portion for engaging a threaded upsettingmember, said bore being tapered away from said head with the threaddepth reduced in height in accordance with said taper, thereby providingfor outward bulging anywhere along the extent of the tapered wallthickness as determined by the thickness of the work against which thebulge is pressed in the axial direction.

6. A tubular rivet adapted to be upset in work by outward bulging of thewall of the rivet under an axial upsetting force and axial pressing ofthe bulge against the face of the work, said rivet comprising a shankwith a substantially uniform outer diameter having a head end and a boreextending into said shank from said head end, said bore tapering awayfrom said head end providing gradually changing wall thickness foroutward bulging anywhere along the extent of the tapered wall asdetermined by the thickness or the work against which the bulge ispressed in the axial direction, said bore terminating in a cylindricalportion having a thread therein which extends into and along the taperedportion ofthe bore.

7. A tubular rivet adapted to be inserted in an aperture and upsettherein from one side of they work to grip the work by outward bulgingthereof and axial pressing of the bulge against the face at the oppositeside of the. Work, said rivet comprising a shank having a bore.extending into said shank from an end thereof and a threaded portion atthe other end of said shank with a uniform root diameter not greater-Jthan the diameter of said bore at the first-mentioned end for engagingan upsetting tool inserted in the bore from said first-mentioned end,said shank having a wall of gradually decreasing thickness toward saidfirst-mentioned end to provide for said outward bulging anywherealongthe extent of the gradually decreasing wall thickness as determinedby the thickness of -the work against which the bulge is pressed in theaxia direction. a

8. A tubular rivet adapted to grip work by outward bulging thereof andaxial pressing of the bulge against the face of the work, said rivetcomprising a shank of substantially 'uniform outside diameter having abore extending-into said shank from an end thereof and being internallythreaded at the other end of said. shank with .the

i diameter of said bore at the first-mentioned end being at least asgreat as the diameterof the thr a r s and th di me er; 0.1: t e t r adroots being uniform throughout, said bore taper- REFERENCES CITED ingaway from said first-mentioned end of the shank toward said other end ina manner such g flggg ggf fff are of record m the that threads locatedin the tapered region have crests conforming to said taper to provide a5 UNITED STATES PATENTS tapered wall thickness for said outward bulgingNumber Name Date anywhere along the extent of the tapered wall 1,678,931Blumberg July 31, 1928 thickness as determined by the thickness of the2,088,358 Adams July 2'7, 1937 work against which the bulge is pressedin the 2,324,142 Eklund July 13, 1943 axial direction. 10 2,3 9, DexterOct. 3, 1944 RUSSELL S. COLLEY. 2,3 ,96 Johnson Jan. 9, 1945

